One question though I'm expert tier for buildings, but dont have expert buildings on my build tab and theres no option to upgrade on the building. Do I need to upgrade my Island as a whole to reach the further tiers?

In order to upgrade the building, click on it to open the crafting menu. Then click the small cog in the top left of that menu. Then click the upgrade tab on the right side of the next menu. Now add the required resources. Finally click the red upgrade button at the bottom. You can repeat this procedure with most buildings all the way to T8. A few buildings do not reach T8.

If you find that the next level upgrades are not available to you, check in the destiny board to see if the "Adventurer" Level you are on allows for the next building. As you level the Adventurer Mastery, you lock better building upgrades.

A Journeyman adventurer cannot have an Adept level building, and an Adept adventurer cannot build a Master's level building, etc...

In order to upgrade the building, click on it to open the crafting menu. Then click the small cog in the top left of that menu. Then click the upgrade tab on the right side of the next menu. Now add the required resources. Finally click the red upgrade button at the bottom. You can repeat this procedure with most buildings all the way to T8. A few buildings do not reach T8.

In order to upgrade the building, click on it to open the crafting menu. Then click the small cog in the top left of that menu. Then click the upgrade tab on the right side of the next menu. Now add the required resources. Finally click the red upgrade button at the bottom. You can repeat this procedure with most buildings all the way to T8. A few buildings do not reach T8.

Mind posting a Screenshot cant see it.

This thread is from 2015 so it's pretty outdated from what I can tell.

To upgrade your buildings you have to interact with it. There should be a portrait of the vendor's worker which you can click on which should change the menu. Click on "Upgrade" which should be nearer to the bottom. To input the materials required to upgrade the building you need to now exit the menu and go to the scaffolding on the side of the building. Click on the scaffolding, a new menu should pop up and with the materials required (they should be displayed on the new menu) you can click the + button to add the remaining required materials. Once all of the materials have been added the building should upgrade and you can repeat the process up to the tier building you want.